We have a ten user SBS2003 premium site. I am pretty confident that all service packs have been applied and all applications are up to date. All workstations are XP Pro (up to date) and all use Outlook 2003 to access Exchange 2003. I have two users who, in week's time, have seen their mailbox size explodefrom 31.2 mb to 207.9 mb for one and the other from 72.1 mb to 145.5 mb. (this information is gleaned fromthe Outlook mailbox cleanupsize function). There has been no increase in traffic to their mailboxes. I have policies set where user's Sent Items, Deleted Items andInbox folders are auto archived to the local drive on their computers daily. The policy keepsexchange/outlook's folder's contentsfor a week. Everything older than a week is auto archived. The worse user has about30 message in his inbox and 50 in his sent items folder. He has about 2,500 messages archivedlocally. Nonetheless Outlook reports that his inbox is about 1.1 mb. This is impossible - none of his messages even with theattachements thatsome have add up even close. The same is true for sent items folder - about 50 items - but the size is 900 kb. Again, this is impossible. We use Symantec Corporate server based anti-virus (v. 10.1). We have used this for many years and this issue with the mailboxes just started this week. One thread here suggested that anti-virus software on the server may affect mailbox size. The discussion there was not helpful. The worse user does use Outlook remotely. The other user does not access Outlook remotely. I am at a loss to understand this. Can someone give me some guidance on how to get a grip on this problem? I have increased quotas so users do not become barraged with warning messages of restricted from sending automatically as a stop gap measure. Thanks very much.

Hi, Where do you check mailbox size in ESM or in Outlook folder size properties? Sometimes mails stuck into at root level which you can not see in outlook and you may need to delete it with MFCMapi. http://exchangeshare.wordpress.com/2007/12/27/mailbox-is-empty-but-esm-still-shows-size-count%e2%80%a6/

Hi, Actually, we have an easier method to check the root folder of the mailbox instead of using MFCMapi too. 1. Created a new Outlook profile this user in Online Mode 2. Right click the Mailbox Root and click Properties 3. Under the Home Page tab, please uncheck Show home page by default for this folder 4. Checked Mailbox root for any message. In addition, I also suggest you refer to following articles to ensure the background cleanup process is running correct: Mailbox sizes or folder sizes are incorrect in Exchange System Manager, Move Mailbox operations are unsuccessful, and "unread receipt" messages are not delivered in Exchange 2000 Server or in Exchange Server 2003 http://support.microsoft.com/kb/891789/en-us Mike